<template>
    <div class="home-category" @mouseleave="categoryId=null">
        <ul class="menu">
            <li v-for="item in menuList" :key="item.id" @mouseenter="categoryId=item.id" :class="{active:categoryId===item.id}">
                <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
                <template v-if="item.children">
                    <RouterLink
                        v-for="sub in item.children"
                        :key="sub.id"
                        :to="`/category/sub/${sub.id}`">
                        {{ sub.name }}
                    </RouterLink>
                </template>
                <span v-else>
                    <XtxSkeleton width="60px" height="18px" style="margin-right:5px" bg="rgba(255,255,255,0.2)"/>
                    <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)"/>
                </span>
            </li>
        </ul>
        <!-- 推荐商品弹层 -->
        <div class="layer">
            <!--<h4>分类推荐
                <small>根据您的购买或浏览记录推荐</small>
            </h4>-->
            <h4 v-if="currCategory">{{ currCategory.id === "brand" ? "品牌" : "分类" }}推荐
                <small>根据您的购买或浏览记录推荐</small>
            </h4>
            <ul v-if="currCategory && currCategory.goods && currCategory.goods.length">
                <li v-for="item in currCategory.goods" :key="item.id">
                    <RouterLink to="/">
                        <img :src="item.picture" alt="">
                        <div class="info">
                            <p class="name ellipsis-2">{{ item.name }}</p>
                            <p class="desc ellipsis">{{ item.desc }}</p>
                            <p class="price"><i>¥</i>{{ item.price }}</p>
                        </div>
                    </RouterLink>
                </li>
            </ul>
            <ul v-if="currCategory && currCategory.brands && currCategory.brands.length">
                <li class="brand" v-for="item in currCategory.brands" :key="item.id">
                    <RouterLink to="/">
                        <img :src="item.picture" alt="">
                        <div class="info">
                            <p class="place"><i class="iconfont icon-dingwei"></i>{{ item.place }}</p>
                            <p class="name ellipsis">{{ item.name }}</p>
                            <p class="desc ellipsis-2">{{ item.desc }}</p>
                        </div>
                    </RouterLink>
                </li>
            </ul>
        </div>
    </div>
</template>

<script>
import { findBrand } from "@/api/home.js";
import { ref, reactive, computed } from "vue";
import { useStore } from "vuex";

export default {
    name: "HomeCategory",
    setup(){
        /**
         * 1. 获取vuex的一级分类，并且只需要两个二级分类
         * 2. 需要在组件内部，定义一个品牌数据
         * 3. 根据vuex的分类数据和组件中定义品牌数据，得到左侧分类完整数据(9分类+1品牌)数组
         * 4. 进行渲染即可
         */

        const brand = reactive({
            id: "brand",
            name: "品牌",
            children: [{
                id: "brand-chilren",
                name: "品牌推荐"
            }],
            brands: []
        });

        const store = useStore();
        const menuList = computed(() => {
            const list = store.state.category.list.map(item => {
                return {
                    id: item.id,
                    name: item.name,
                    // 防止初始化没有children的时候调用slice函数报错
                    children: item.children && item.children.slice(0, 2),
                    goods: item.goods // 推荐商品
                };
            });
            list.push(brand);
            return list;
        });

        // 获取当前分类逻辑
        const categoryId = ref(null);
        const currCategory = computed(() => {
            // return menuList.value.find(item => item.id === category.value);
            return menuList.value.find(item => item.id === categoryId.value);
        });

        // 获取首页滚动条数据
        findBrand(9).then(data => {
            console.log(data);
            brand.brands = data.result;
        });

        return {
            menuList,
            categoryId,
            currCategory
        };
    }
};
</script>

<style scoped lang="less">
.home-category {
    width: 250px;
    height: 500px;
    background: rgba(0, 0, 0, 0.8);
    position: relative;
    z-index: 99;

    .menu {
        li {
            padding-left: 40px;
            height: 50px;
            line-height: 50px;

            &:hover, &.active {
                background: @xtxColor;
            }

            a {
                margin-right: 4px;
                color: #fff;

                &:first-child {
                    font-size: 16px;
                }
            }
        }

        .xtx-skeleton {
            animation: fade 1s linear infinite alternate;
        }

        @keyframes fade {
            from {
                opacity: 0.2;
            }
            to {
                opacity: 1;
            }
        }
    }

    li.brand {
        height: 180px;

        a {
            align-items: flex-start;

            img {
                width: 120px;
                height: 160px;
            }

            .info {
                p {
                    margin-top: 8px;
                }

                .place {
                    color: #999;
                }
            }
        }
    }

    .layer {
        width: 990px;
        height: 500px;
        background: rgba(255, 255, 255, 0.8);
        position: absolute;
        left: 250px;
        top: 0;
        display: none;
        padding: 0 15px;

        h4 {
            font-size: 20px;
            font-weight: normal;
            line-height: 80px;

            small {
                font-size: 16px;
                color: #666;
            }
        }

        ul {
            display: flex;
            flex-wrap: wrap;

            li {
                width: 310px;
                height: 120px;
                margin-right: 15px;
                margin-bottom: 15px;
                border: 1px solid #eee;
                border-radius: 4px;
                background: #fff;

                &:nth-child(3n) {
                    margin-right: 0;
                }

                a {
                    display: flex;
                    width: 100%;
                    height: 100%;
                    align-items: center;
                    padding: 10px;

                    &:hover {
                        background: #e3f9f4;
                    }

                    img {
                        width: 95px;
                        height: 95px;
                    }

                    .info {
                        padding-left: 10px;
                        line-height: 24px;
                        width: 190px;

                        .name {
                            font-size: 16px;
                            color: #666;
                        }

                        .desc {
                            color: #999;
                        }

                        .price {
                            font-size: 22px;
                            color: @priceColor;

                            i {
                                font-size: 16px;
                            }
                        }
                    }
                }
            }
        }
    }

    &:hover {
        .layer {
            display: block;
        }
    }
}
</style>
